My laptop overheated and shut down again. This time it didn't shut down normally, so I had to do a full re-start, so I didn't get to see exactly what happened before the shutdown. I checked the size of the file it was downloading and could tell that it wasn't finished. I went through the process to get a new url with new authparam. I renamed the old file to the file name in the new url, using double quotes. Then I ran wget -c <new url with new file name with new authparam> and it immediately resumed downloading at 66%. "-c" is for continue. So, that is one method for anyone else that needs it. In my previous internet searches, I did read various things about the behavior of -o changing from version to version, regarding continuing or overwriting. So, what worked in the past may not anymore. As to Grid Infrastructure, I don't know that I am ready to play with that yet. I think I will just settle for downloading and installing the 12c database for now. I will let you know when the download has actually finished.

Download complete! My laptop shut down abnormally again, but the size of the file tells me that it finished downloading first. Thanks again for all the help. Now I just have to unzip and install, so I can start having fun experimenting with the new features.

The strangest thing happened. I got an email saying that there was a response to my post in the installation forum, but when I clicked on the discussion link it went to an unrelated thread in a different forum. I found the correct thread in the correct forum and tried to post the response below a few times, but each time I got a vague message saying that an error occurred and to try again. So, I am going to try to post it here for now, so that those trying to help (Billy) will know that the problem appears to be solved.

The Windows Task Manager, under Applications, shows Database Configuration Assistant Running. I don't see any log files in the c:\oracle12c directory or any of its sub-directories. However, it finally dawned on me to check and see what I could find and do and guess what, I found OraDB12Home1 and Application Development and SQL*Plus and connected as sysdba, unlocked the scott account, connected as scott/tiger and behold everything works, as shown below. So, I guess it finished even if it doesn't look like it.